linux-kernel - [PATCH v2 1/2] perf srcline: Make addr2line configuration failure more verbose

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Message-Id: <20230613034817.1356114-2-irogers@google.com>
Date:   Mon, 12 Jun 2023 20:48:16 -0700
From:   Ian Rogers <irogers@...gle.com>
To:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Ian Rogers <irogers@...gle.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Tom Rix <trix@...hat.com>, linux-perf-users@...r.kernel.org,
        linux-kernel@...r.kernel.org, llvm@...ts.linux.dev,
        Changbin Du <changbin.du@...wei.com>
Subject: [PATCH v2 1/2] perf srcline: Make addr2line configuration failure
 more verbose

To aid debugging why it fails. Also, combine the loops for reading a
line for the llvm/binutils cases.

Signed-off-by: Ian Rogers <irogers@...gle.com>
---
 tools/perf/util/srcline.c | 34 +++++++++++++++++++++-------------
 1 file changed, 21 insertions(+), 13 deletions(-)

diff --git a/tools/perf/util/srcline.c b/tools/perf/util/srcline.c
index aec596a0b0bb..d477332586b2 100644
--- a/tools/perf/util/srcline.c
+++ b/tools/perf/util/srcline.c
@@ -443,7 +443,7 @@ enum a2l_style {
 	LLVM,
 };
 
-static enum a2l_style addr2line_configure(struct child_process *a2l)
+static enum a2l_style addr2line_configure(struct child_process *a2l, const char *dso_name)
 {
 	static bool cached;
 	static enum a2l_style style;
@@ -452,6 +452,7 @@ static enum a2l_style addr2line_configure(struct child_process *a2l)
 		char buf[128];
 		struct io io;
 		int ch;
+		int lines;
 
 		if (write(a2l->in, ",\n", 2) != 2)
 			return BROKEN;
@@ -461,19 +462,29 @@ static enum a2l_style addr2line_configure(struct child_process *a2l)
 		if (ch == ',') {
 			style = LLVM;
 			cached = true;
+			lines = 1;
 		} else if (ch == '?') {
 			style = GNU_BINUTILS;
 			cached = true;
+			lines = 2;
 		} else {
-			style = BROKEN;
+			if (!symbol_conf.disable_add2line_warn) {
+				char *output = NULL;
+				size_t output_len;
+
+				io__getline(&io, &output, &output_len);
+				pr_warning("%s %s: addr2line configuration failed\n",
+					   __func__, dso_name);
+				pr_warning("\t%c%s", ch, output);
+			}
+			return BROKEN;
 		}
-		do {
+		while (lines) {
 			ch = io__get_char(&io);
-		} while (ch > 0 && ch != '\n');
-		if (style == GNU_BINUTILS) {
-			do {
-				ch = io__get_char(&io);
-			} while (ch > 0 && ch != '\n');
+			if (ch <= 0)
+				break;
+			if (ch == '\n')
+				lines--;
 		}
 		/* Ignore SIGPIPE in the event addr2line exits. */
 		signal(SIGPIPE, SIG_IGN);
@@ -593,12 +604,9 @@ static int addr2line(const char *dso_name, u64 addr,
 			pr_warning("%s %s: addr2line_subprocess_init failed\n", __func__, dso_name);
 		goto out;
 	}
-	a2l_style = addr2line_configure(a2l);
-	if (a2l_style == BROKEN) {
-		if (!symbol_conf.disable_add2line_warn)
-			pr_warning("%s: addr2line configuration failed\n", __func__);
+	a2l_style = addr2line_configure(a2l, dso_name);
+	if (a2l_style == BROKEN)
 		goto out;
-	}
 
 	/*
 	 * Send our request and then *deliberately* send something that can't be interpreted as
-- 
2.41.0.162.gfafddb0af9-goog